A non-working computer power supply can be converted for use in other designs. An example is the conversion of the unit into one that you can take with you on trips to power your transceivers.
Necessary
power unit
Instructions
Step 1
Disassemble the power supply case, turn off the fan. Then unsolder the wire from the board that goes to the socket on the case. Then remove the 110 / 220V switch, unsolder the wires from it. Remove the board from the case. Solder a plug with a cord to the pads of the board. Make sure the board is released from the case. Place it on a dielectric surface.
Step 2
Find the resistor R66, which goes from pin 1 of the MC SG6105, solder a 330 Ohm resistor to the second pin to the case. With this, you will simulate a constantly pressed button designed to turn on the computer in order to remake the PSU for other needs.
Step 3
Connect the load. For this, use a 12V light bulb at the output of the unit, turn it on. Use it to check the functionality of the device. Then check the voltage on the bulb with a tester. Disconnect the unit from the network, cut the track that goes from the SQ6105 pin, connect it to pin 20 with a jumper or resistor. Use resistors with a minimum wattage of 0.15 W or less. Plug in the power supply - the light should come on.
Step 4
Unplug the unit from the mains, cut the track near pin 2 and solder two resistors from pin 2 to the case, as well as 1.5 kΩ to the twentieth pin. Plug the unit into the network; if it does not turn on, select the resistors more accurately. At the exit, you should get 2 +3, 3V. Unplug the unit, unsolder unnecessary parts. Use this diagram to rework the block
Step 5
Replace elements C20, C21 with 1500 uF for 16 volts. Screw all the diode assemblies that you have evaporated to the radiator. Connect all anodes together with a thick red wire. Connect the cathodes to pin 8 and pin 9. Unsolder the extra wires from the board. Leave all the red wires, twist them into one wire, take the same number of black wires. Connect a light bulb to the output of the unit and turn it on. Measure the voltage across it, adjust VR1 to the desired value.
